Gas-heated forging or welding furnace.



W. SCRIMGEOUR. GAS HEATED FORGING 0R WELDING FURNACE.

APPLICATION men MAY 4, 19m.

1,206,036. Patented Nov. 28, 191 i 3 SHEETS-SHEET l- 1 JEQ-J- W. SCRIMGEOUR. GAS HEATED FORGING 0R WELDING FURNACE.

APPLICATION FILED MAY 4, I914.

Patented Nov. 28, 1916.

3 SHEETSSHEET 2- W. SCRIMGEOUR. GAS HEATED roaemc on WELDING FURNACE.

APPLICATION FILED MAY 4. 1914.

Patented N 0v. 28, 1916;

3 SHEETSSHEET 3.

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UNITED STATES Parana caries.

WILLIAM SCRIMGEOUR, OF LANCASTER, PENNSYLVANIA, ASSIGNOB T0 MIRCS FUEL- OIL EQUIPMENT COMPANY, INCORPORATED, 0F NORFOLK, VIRGINIA, A CORPORA- TION OF VIRGINIA.

Specification of Letters Patent.

Patented Nov. 28, 1916.

Application filed May 4, 1914. Serial No. 836,287.

To all whom it may concern:

Be it known that I, VILLIAM SORIM- GEOUR, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Gas-Heated Forging or Welding Furnaces, of Whichthe following is a specification.

My invention relates to a heating furnace, in which the metal blanks or other objects are heated by gas.

It further relates to the means for preheating the gas and air prior to their combustion, these means comprising an arrangement of fiues through which pass the highly heated products of combustion, and suitable preheating devices.

My invention further relates to the con struction of these preheating devices and to the construction of the burners themselves.

The invention will be understood from the accompanying description and drawings, in which- Figure 1 1s a vertical longitudinal section of the furnace, showing the system of flues and a preheater and the burner in heating chambers; Fig. 2 is a horizontal section on the plane A-O-B of Fig. 1; Fig. 3 is a horizontal section on the plane AO-A of Fig. 1; Fig. 4 is a vertical transverse section on the plane C0 of Fig. 1, showing the air and burner preheating chambers; Fig. 5 is a front view of the furnace structure showing the fronts of the air preheaters and burners, and the buckstaves or braces in place; Fig. 6 is a view of a modification, showing the preheaters projecting into the preheating chambers from the sides instead of the front of the furnace; Fig. 7 is a horizontal section of the burner body shown in Figs. 1 and 2; Fig. 8 is a vertical transverse section of the burner body on the line E-E of Fig. 7, with the air and gas nozzles removed; Fig. 9 is a vertical transverse section of the burner body on the line FF of Fig. 7; Fig. 10 is a front view of the preheater; Fig. 11 is a view in elevation of the preheater; and Figs. 12 and 13 are vertical longitudinal and transverse sections of the preheater, showing the radiating plates and partition.

In Figs. 1, 2, 3, and 4, the furnace 1 is built of suitable refractory material 2, and contains a work-chamber 3, covered with a roof 4 which inclines downwardtoward the back and tends to curve the flame through the furnace, and a charging entrance 5, which may be closed by a sliding door or other suitable means. An opening 7 ,which may be closed by a loose brick 7 O, is shown in the roof of the furnace in Fig. 1; and another opening 8,'shown closed by a loose brick or cover 9, in Figs. 2 and 3, provides for cleaning slag, etc., from the bottom of the furnace. The furnace is built upon foundation 10, containing transverse channels 11, through which pass bolts 12, Fig. 1, to secure suitable braces or buckstaves, not shown; and also longitudinal channels 13, Fig. 4, in which are secured by bolts or other means, not shown, the braces or buckstaves 13., Fig. 5.

The furnace is preferably heated by producer gas supplied through pipe 14, preheater 15, valve 16, opening 17, to gas chamber 17, Fig. 7, of burner 18, from which it passes out through gas-nozzles 19, 20, 21, into the furnace. Air is supplied through the pipe 22, Fig. 5, pr'eheater 23,

valve 24, to openmg 25, air inlet 25 and air chamber 26 of burner 18, from which it passes out through air nozzles 27, burning gas in the combustion chambers 28, and blowing the flames into the upper part of the work-chamber 3, through which they circulate and leave from the lower part through vents 52, 52.

The burner 18, Fig. 7, consists of a distributing casing 18 divided by a partition 29 into gas chamber 17 and air chamber 26; the partition is pierced by threaded openings 30, 31, 32, into which are screwed the gas nozzles 19, 20, and 21; access to these openings for adjustment and repair of the nozzles is had through the closed holes 33,

34, 35, and loose bricks 62, 63, 64, in the furnace wall, Fig. 2. On either side of the air inlet 25, Fig. 9, are passages 36, 36, through which the gas passes to gas nozzle 21. On the air side of the burner casing, Fig. 7, are outlets 37, 38, 39, in which are secured the several air nozzles 27.

The prcheaters 15 and 23 are alike in structure, and are shown in detail in Figs. 10

to 13. A casing is provided with in wardly projecting heat-radiating plates or ribs 41, and a flanged rim 42, to which latter is secured a cover 43, carrying a partition plate 44 which projects between the heatradiating plates 41, therebv providing a return bend or channel within the casing. Openings 4! 46, in the cover 43 provide means for securing pipes 47, 48, respectively, shown in Figs. 1 and 6, for conducting the air or gas.

The modification in Fig. 6 differs from that in Fig. 1 only in the insertion of the preheaters 49, 50, through the sides of the furnace, instead of through the front, as shown in Figs. 1, 3, and 5; and in supplying the air and gas through suitable openings in the ends of the burner casing 51, instead of along one side, as shown in Figs. 1 and 2.

The operation of the furnace is as follows :The flames from the burner 18 and combustion chambers 28, F ig. 2, enter the work chamber 3, from which the heated gases may pass, in greater or less quantity, through opening 7 in the roof 4, this opening being partly or completely closed by a loose brick or damper 70. The heated gases also pass through an interconnected fluesystem in the front Wall of the furnace, comprising outlets 52, 52, Figs. 1 and 3, and a common or omnibus vent 52', Fig. 3, into the preheating chambers 54, (Figs. 1, 3, and 4) passages 55, 56, burner heating chamber 57, and out the vents 58, 59, 60, 61, which may be closed, partly or entirely, by a loose brick, one being shown at 71 in dotted lines over vent 61 in Figs. 1 and 4. The regulation of the openings 7, 58, 59, 60, 61 controls the quantity and direction of the heated gases passing through the preheating chambers 53, 54, and burner chamber 57, thereby controlling the draft through the furnace and controlling the temperature of the in coming gases, and also obtaining a maximum temperature within the work chamber for a given consumption of gas. The heated gases in passing through the preheating chambers heat the preheater casings 40, through which heat is conducted to the radiator plates or ribs 41, the latter, presenting an extended surface, uniformly heat the flowing gases to a high temperature. The products of combustion circulating around the burner 18 also raise its temperature, thereby conserving the heat which the air and gas have absorbed while passing through the preheater, and also raise the temperature of the furnace walls, thereby preventing loss of heat from the combustion chambers 28. On closing vents 7, 58, 59, the heated gases travel almost entirely through preheating chamber 53 and the corresponding end of the burner chamber 57,

and out through vents and 61; conversely, on opening vents 58 and 59, and

closing vents 60 and 61, the preheating chamber 54 and corresponding end of burner chamber 57 will receive the most heat.

I claim 1. In a furnace, a refractory structure, a work-chamber therein, 'as burners to heat said work-chamber, an interconnecting fluesystem leading from said work-chamber to conduct heated gases from said work-chamber, comprising preheating chambers, gas and air heaters in said chambers, a separate vent from the work-chamber to each preheating chamber, an omnibus vent to the preheating chambers, a burner-heating chamber, separate vents from each preheating chamber to the burner-heating chamber, and a plurality of controllable outlets from the burner chamber.

In a furnace, a refractory structure, a work-chamber therein, a' combustion chamber opening into the upper part of the Workchamber, outlets from the lower part of the work-chamber, preheating chambers, a burner-heating chamber, a system of vents arranged to conduct predetermined quantities of the products of combustion to the preheating chambers, flues connecting the preheating and burner chambers and controlled outlets to conduct the products of combustion in a predetermined direction through the preheating and burner chambers.

3. In a furnace, a refractory structure, a worlochamber therein having a roof slanting toward the wall opposite the combustion chambers, a closable outlet in the roof of said furnace, combustion chambers opening into the upper part of said furnace, outlet vents from the lower part of said furnace, preheater chambers and a burner-heating chamber, a system of interconnected flues to conduct heated gases first into the preheater chambers, then into the burner-heating chamber, and closable outlets from said burner-heating chamber.

4. In a furnace, a refractory structure, a work-chamber therein, a gas burner to heat said work chamber, an interconnecting fluesystcm in the refractory structure, a plurality of chambers in proximity to each other and constituting a part of said fluesystem, two of said chambers constituting preheating chambers and arranged to receive heated gases in parallel from said \\'orkcha1nber, a gas preheater in one of said preheating chambers, an air preheater in the other of said preheating chambers, outlets from said preheating chamber leading into a burner-heating hamber, and pipe connections and valves connecting said gas preheater and air preheater with said gas burner.

In a furnace, a refractory structure, a work-chamber, gas burners to heat said work-chamber, a system of flues leading from said Work-chamber, preheating chamquantity of products of combustion over one 10 bers in said refractory structure and conpreheater than over the other.

nected to said fines, a gas preheater, an air In testimony whereof I aflix my signature preheater, said gas and air preheaters in in presence of tWo Witnesses.

' preheating chambers and arranged to be WILLIAM SCRIMGEOUR heated by the products of combustion from said combustion chamber, and means to WVitnesses:

create a greater draft over one preheater J. H. BRIOKENSTEIN, than the other, thereby conducting a greater 0. W. FOWLER.

Copies of this patent may be obtained for five cents each by addressing the Commissioner of Patents, Washington, D. 0. 

